It's OK from our point of view; what is one more God to a Pagan? But I'd be surprised if you could get the Christians to swallow it. They tend to be a bit exclusive.
And make no mistake; Wicca is a religion, and your religion is that point from which you view the universe. If you become a witch, you will find that you have changed your basic point of view on a lot of topics.
For instance; we don't have any concept of "heaven and hell." We believe that after you die, you either hang out and rest for a while, consolidate the lessons you have learned, do a bunch of work from there not here, or some combination of all of these and more. Then, when you are ready, you come back in another physical body. We believe this, because a fair number of us remember doing it! <g> And that's a far cry from having a one shot to please God or not (as if you could really do anything about it in a religion that believes in predestination anyway) and then spending eternity being punished for making the wrong choices or rewarded for making correct ones.
We don't have any concept of sin. In the Christian religion you sin if you disobey God. Our Gods (and Goddesses) ask us to do stuff for them, too. But we can always decline. <g> And there is no great list of "Do This" and "Don't Do That." Our Gods expect us to figure stuff out for ourselves, using the minds they gave us. (I've written a whole book on the topic of Pagan/Wiccan Ethics.) If we do something stupid, we generally figure it out because the consequences of our actions are not what we had hoped. Since we believe in something we call "The Three-fold Law," which states that our actions come back to us magnified by at least 3, we pay attention to how the universe treats us, and so we have ample opportunity to see whether we have done things we should have done or not. (Christians recognize the veracity of this, as well. It's in the "As ye sow, so shall ye reap." stuff.)
We don't find any part of this planet intrinsically evil, nor do we seek to "subdue" anything. Instead, we see it all as holy and sacred. Our bodies, the trees and plants, other animals, the weather; everything! We worship the Earth, and see her as our mother. It makes us cry to see all the pollution, and the way in which people treat the Earth when they expect their God to come back any minute, and make it all go away.
And we don't expect that, either. From our point of view, we are here for the duration. Even if we didn't love the Earth as we do, it only makes sense to recycle and conserve; resources are limited after all. And when we have used up all of the fossil fuel it's going to be gone for good. (Or at least, for good from our perspective. We won't have millions of years to wait until more is made.<g>)
And the list goes on and on. Even the things that look similar (such as helping others) are really done for different reasons in the two religions.
And most basic of all; we believe that there are many paths, and all are equally valid. I would never try to tell you you are "wrong" to be a Christian. If it speaks to you, and something in you responds to the teachings you find there, and it makes your life better and more joyous, then it's probably the path you should be on. Go for it! (In my case, I was always miserable when I was a Christian; I prayed every night to die before the morning, and every morning to die before the night. This is not any way to live.) I don't have to tell you how Christians view other religions! <g> But we would have no beef with you if you would just let us live in peace.
I would ask you one question, though. Why do you want to be a Witch?
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